/*
 *  Copyright 2008 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.mybatis.generator.codegen.ibatis2.dao.elements;

import static org.mybatis.generator.internal.util.JavaBeansUtil.getSetterMethodName;

import java.util.Set;
import java.util.TreeSet;

import org.mybatis.generator.api.IntrospectedColumn;
import org.mybatis.generator.api.dom.java.FullyQualifiedJavaType;
import org.mybatis.generator.api.dom.java.Interface;
import org.mybatis.generator.api.dom.java.JavaVisibility;
import org.mybatis.generator.api.dom.java.Method;
import org.mybatis.generator.api.dom.java.Parameter;
import org.mybatis.generator.api.dom.java.TopLevelClass;

/**
 * 
 * @author Jeff Butler
 * 
 */
public class DeleteByPrimaryKeyMethodGenerator extends AbstractDAOElementGenerator {

	public DeleteByPrimaryKeyMethodGenerator() {
		super();
	}

	@Override
	public void addImplementationElements(TopLevelClass topLevelClass) {
		Set<FullyQualifiedJavaType> importedTypes = new TreeSet<FullyQualifiedJavaType>();
		Method method = getMethodShell(importedTypes);

		StringBuilder sb = new StringBuilder();

		if (!introspectedTable.getRules().generatePrimaryKeyClass()) {
			// no primary key class, but primary key is enabled. Primary
			// key columns must be in the base class.
			FullyQualifiedJavaType keyType = new FullyQualifiedJavaType(introspectedTable.getBaseRecordType());
			topLevelClass.addImportedType(keyType);

			sb.setLength(0);
			sb.append(keyType.getShortName());
			sb.append(" _key = new "); //$NON-NLS-1$
			sb.append(keyType.getShortName());
			sb.append("();"); //$NON-NLS-1$
			method.addBodyLine(sb.toString());

			for (IntrospectedColumn introspectedColumn : introspectedTable.getPrimaryKeyColumns()) {
				sb.setLength(0);
				sb.append("_key."); //$NON-NLS-1$
				sb.append(getSetterMethodName(introspectedColumn.getJavaProperty()));
				sb.append('(');
				sb.append(introspectedColumn.getJavaProperty());
				sb.append(");"); //$NON-NLS-1$
				method.addBodyLine(sb.toString());
			}
		}

		sb.setLength(0);
		sb.append("int rows = "); //$NON-NLS-1$
		sb.append(daoTemplate.getDeleteMethod(introspectedTable.getIbatis2SqlMapNamespace(),
				introspectedTable.getDeleteByPrimaryKeyStatementId(), "_key")); //$NON-NLS-1$
		method.addBodyLine(sb.toString());
		method.addBodyLine("return rows;"); //$NON-NLS-1$

		if (context.getPlugins().clientDeleteByPrimaryKeyMethodGenerated(method, topLevelClass, introspectedTable)) {
			topLevelClass.addImportedTypes(importedTypes);
			topLevelClass.addMethod(method);
		}
	}

	@Override
	public void addInterfaceElements(Interface interfaze) {
		Set<FullyQualifiedJavaType> importedTypes = new TreeSet<FullyQualifiedJavaType>();
		Method method = getMethodShell(importedTypes);
		context.getCommentGenerator().addGeneralMethodComment(method, introspectedTable, "根据主键删除记录");
		if (context.getPlugins().clientDeleteByPrimaryKeyMethodGenerated(method, interfaze, introspectedTable)) {
			interfaze.addImportedTypes(importedTypes);
			interfaze.addMethod(method);
		}
	}

	private Method getMethodShell(Set<FullyQualifiedJavaType> importedTypes) {
		Method method = new Method();
		method.setVisibility(JavaVisibility.PUBLIC);
		method.setReturnType(FullyQualifiedJavaType.getIntInstance());
		method.setName(getDAOMethodNameCalculator().getDeleteByPrimaryKeyMethodName(introspectedTable));

		if (introspectedTable.getRules().generatePrimaryKeyClass()) {
			FullyQualifiedJavaType type = new FullyQualifiedJavaType(introspectedTable.getPrimaryKeyType());
			importedTypes.add(type);
			method.addParameter(new Parameter(type, "_key")); //$NON-NLS-1$
		} else {
			for (IntrospectedColumn introspectedColumn : introspectedTable.getPrimaryKeyColumns()) {
				FullyQualifiedJavaType type = introspectedColumn.getFullyQualifiedJavaType();
				importedTypes.add(type);
				method.addParameter(new Parameter(type, introspectedColumn.getJavaProperty()));
			}
		}

		for (FullyQualifiedJavaType fqjt : daoTemplate.getCheckedExceptions()) {
			method.addException(fqjt);
			importedTypes.add(fqjt);
		}

		context.getCommentGenerator().addGeneralMethodComment(method, introspectedTable);

		return method;
	}
}
